Backing up files on ubuntu for reinstall. Will there be problems with permissions?

Backing up files on ubuntu for reinstall. Will there be problems with permissions? I have some very important files I want to backup before I reinstall my Ubuntu back to 9.04 from the 9.10 (its causing me all sorts of problems).
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Total answers/comments: 2

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Guest [Entry]

You are better off if you use tar (with some compression if you wish) and save this to DropBox, then restore from the tar file, and the permissions will be restored.

Guest [Entry]

"If you re-install, and re-create your user, you're not guaranteed that you'll have the same user ID. (I think ubuntu starts creating user ids at 500).

But it's really no big deal: as @Kami and @Bobby mentioned, a couple of simple commands can restore the ownership."